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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56761a5fff0230b0c4aacfb63c1f033abcc4daee98376df333e57e8d17af23b2' 
  AND token = 'Qlsrx0TWJ8A7pJrzBAJD6dPXA693AnoM9W832/d94HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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