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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afa22ce0d5dc4114b236f52fd7167ca6247473b2dada6e87352d20db1c2d743' 
  AND token = 'qWh63e0QZpcyq0dfslEI8eX5kbWgO5bdVSnQcqwUSSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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