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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3f8bd3500efe6b859ccda19d17494f965031fad74908bdb18233e5e512aa6b' 
  AND token = 'S07tPUd5gSdrb9ouhJVGPUB9pWNXJ6WAdAToMLvlVyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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