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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50322792d76cf42fd99cf66b15952138642d6aa00e90704f1a44e4db3dfddc60' 
  AND token = 'btm3btU2e4hSWlxWaklb7HB88ZTGZWv4AzUkdSyzuJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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