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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bac388e32ba214777e58dedbc4f543bdc6b5ce87bb5d1b9348e2f31f68acf2' 
  AND token = 'T0502NBCFECNNwr3cT9t4QdPrRYkJiWfND4+9zpfM78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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