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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7daa3b4511b6f3d5ce656009c4902fe9e8ed65a58a4e473e93797e5c66955a5a' 
  AND token = 'Zib6pCNYarc4mM76dsgSAWnanuxXOuNBqnce1CO07Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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