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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37fc7be3655328776a1d1601e42b98c2b73de0b69a6b0dd1ce27f9e48e8b46a3' 
  AND token = 'JGbkJftPzG65ecqu11kKgjMovfxI5Gy3M7vc1IykauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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