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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f0be11434a9ae1bb76691f8b7c9c4390de07aadb882d94bc7bb1356dce85b7' 
  AND token = 'W85knLv3JtUfSsWKgV8jDFjaWTGXlG0jWlTMmzegreY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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