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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f51d0ead5ad2c8928df588da9e02741792f0c8939313e12bb5e71d5e60328c6' 
  AND token = 'bLCGW6WPb39DSlswfctsoXyouItFycuWKVdQKko9A0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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