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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6686c7bd554bdb0d2f3e1f07e528475acf47054e03faa8e36639e5db865f91be' 
  AND token = 'Za6O81T2vLX7DQZiwQFlHLK/ktRiZU7DthdDByXc3bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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