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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0e3a84bd79ca094c7ee96020d31c81f3b3a99b6b4debfe15a59ba82cc5a4eb' 
  AND token = '9BWLwlGhZLXbvSVnsREItXP3+KCChnPzaqb50hF2nUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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