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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601344aad55aa0bc6bd4afa43e0f7bb4d14f829e0179b59b189ae5b9bdb22a63' 
  AND token = 'yN/VadkN6Dw9kwPZ+tZWaWPWI3wSktC4+whSXAArhMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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