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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d886e96e7d5cf2fb1341aad7f658897c451d9cc818065c28d198c74521e3323' 
  AND token = 'uf1LB0yyzQXYg9Y2iuvqlgF3JxlrrhVNCOnrrThEr5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}