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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98311c465d7d6e2c94d7f9dcccca95c6a1a35faefbf3e4b58bd03e0367bf4b74' 
  AND token = 'Nn8e9ZRZLio6KNbfBqiosJzB2Fk8nW6gn98NQZM23/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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