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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0c39370d157c8f83ef3e8b9fe15b9808e4b8ef1e7881986409bc1a6508ee3a' 
  AND token = '1wyrm32uB6ov/AX5UtLA1s4Hiv8oOczgMBwdY3wHaKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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