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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ecb501ca2eee5247d11c0c97249695744ef5fbe913c8dd679b4cf7f12a9a02' 
  AND token = '9BWoaOxj6aKIWb+di00W+h64FybJwDnGQ+oPapmGcck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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