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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3edac3b57fd15b6641586315d855a0a5238bcc93e06a422b23560597ba2d2a' 
  AND token = '4E66FxzLqErVtfXhZkZM4JQ2ODg1MbufNJU7AM59HR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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