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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0bed3655adf3d0687d192877733729c87d7cc5d070c8d7a993cff2830c9247' 
  AND token = 'rry4Udmw8wDfFeORTQcOuF75PQhMSkDrW68xz+vuMVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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