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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a91ff0674c4be52188653df8a32eff4e3bc29f2c81011be2f58d52850c41991' 
  AND token = 'jGzfF/I3abQmz1pkyq8mcxdoAF28Cshbv2upo/WHXsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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