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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f587d992f06b6a99a3fd279591d06c5b20a43248dd29f7064fe0401ad80c13c' 
  AND token = 'NgkpFgh//UDheU5mgZGekTFSICOfLK3dPf7l/S18k5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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