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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108af5527d87d6a20c30070289e14c09f8125d9df9defa978cbcf95afd0e356d' 
  AND token = 'qXXd9jZbzWr8PEFw01rb7n44VQlX2smt0TSoH4AG1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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