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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766cdb6eb982fcc26c9351a0a009be2b3c71849020c749335753c2016fe6bd86' 
  AND token = 'Y74o+5mZpOSor07+pxjvDn9StkxKKxSVAsVS4/2QI2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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