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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a9b8bc397ed68f4f22a1d179793366b8cd60581b1a8a3b97358f287627b7c6' 
  AND token = '9+jOeaJrSRD15L/K90IUXR6p8DDol7pCytsAKw80s5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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