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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a7043f3e3c08245663e3e67a5734bdd5aff5dc9c5b7ae97a76d894ed5e5c49' 
  AND token = '934P09qQlZRxEzHJWEC60m52ENTKDbSfU2YnEnuQCik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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