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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfe5858eb4122ac49b6c9605167501b563b4a3e89349d424e91824410e8bd18' 
  AND token = 'KI4g1yqtf6xk+G/LoCiTjRUK1BW34FGlV5cfzC1NXOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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