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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df85eeadbdf280c7eb5f50138dddcb69c4e817aedfbd3838bc2e63c7a31fba9b' 
  AND token = 'phNtA7/y0BcOgdHJfg6JVNwBhm+mcjuRRnMBYBgCMuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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