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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8ad8637966838a7573f59f0413424a62ce4ac57da8759d6e2a1be3a9008846' 
  AND token = '3rD869czZRlyBg4NRgOkIlsHcGffmO6UOX6uLXSqP6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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