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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10d0ce9049303efcd41308076e2d4b91297791acda264d3b0200a982cf1df58' 
  AND token = 'm5RZ+eIzt9qS4pX7lwyLjZQXvS2gOcZdje7TwccuwyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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