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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7f0b11c57f744d9e49d22ec70e338c8e3a09c78adf9e08bd90933ba7a94197' 
  AND token = 'n7UuRvN9Re1Mgd18uD7lfx/+isBYtixtjy9JlbQV3sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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