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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1e275ad9d0592a26fcc608e04fbfe61c3122c5724726b19c3eeefdc35c5930' 
  AND token = 'e0dl+TyjX3qTQ4a4xo7F9uVgvjVcZVykemqYoM1bs/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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