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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c71dd5ae0baca5eaf6d2957ad482ee456b4eab690db9752350256f57176e0ae' 
  AND token = 'aJyp38/hSSqCa4FLE+yff9qpZZCy+FtIuc28Z33rnKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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