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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8163d9e2e13fed5a0f4e4d6a8937277be98a2204880532f4fb2075db07ade468' 
  AND token = 'e1oqS9elmgDuN1ccDhhCvBaA89Fi97GrudpZoUzDB20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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