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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06768e0374f996fe65aa134425c11b6c4ac683757f797b1fcec3c74424f5116' 
  AND token = 'RFiyaGM7Vtf/lJjtql6bGJY0Bk1dfQdUUOsQHLAzGjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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