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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd02abddd4f42b8f2c732b8e9951dd29585b97e6595f0bcdcf7760fcc3935b7' 
  AND token = '1jjH7xdR2v6sdqawXLtQdqd7ZKyosU+a2rnkYzcCFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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