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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88309d7c106f829057d0b379fb305deeeaddda6036e9523e22c25f3634f8feca' 
  AND token = 'oy0bVto3xCFVtw9mYYSXJKa1xQIzOQMzRvj8pdp1v3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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