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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b2d83ac6b9c01932fcb583790f65f36e373af7dd3b0fa81e1086ca48d1a719' 
  AND token = 'y6Vm1K2seYlQpEX7T1mQWpWnW11Y8i+g3YSL0h09K10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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