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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef411db83a7117185696decc4e8d0546795e33a5b5c59c551cbd58b126dd7277' 
  AND token = 'eccBmsTPSFroa1I+JED5Q+RF6XdIyxBJagPvKdSa5V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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