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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ff4e06f2899c6abe6c192e2403bc6bbe9fd275c881dec0dd8a0f3a9e25877b' 
  AND token = 'qo0Mq2wyGl5RQaOvGQXUw7lveUzy37HwOB8QEnRLYUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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