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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80111c7a3923e6d95949cd0ad6b5ee6e29429f9e937ebb76228dbf960ef9e329' 
  AND token = '76vsRyRGjO8e2anBQVHMjRqv6zk8PqxN3aJf6tXWRWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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