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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81fd660ac278232d1df9b26d1a155a2491b3d06e80e8c837abdbfd1f7f97cda' 
  AND token = '+EitVtnXX8EagC7Rs0gHvMl8l4dx27Dub9lixqAsuAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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