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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f896f187350aa3a93b52dc52136f1323f44ff07691a0131fc4745f63b641a135' 
  AND token = 'OJ3QFa08GQriEwXbvZIL1E1TQiQ0CY/n6s0IGPbpzzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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