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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abf6a1d38da86b3711847d9629a33b101da43ccc37e60a9242a8862248c86af' 
  AND token = 'rsduWJvcaFyM4J51XkrmK/tnixvjj7co0EVXNMEXuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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