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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e85457975b5e3e04ef0b5f1e6771c953b3d36beb2bdd82c0ec0e5ff1047beca' 
  AND token = 'kY1NcNNMppZQnUS5AVjFuDmYRXUuGfQDknU8VM8dwno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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