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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0f9cf4659087cd3a98fa6801fcc1c369a58c1cbbd6978d36078fc2da9830a7' 
  AND token = 'AnmG/3oLXbNrDx9uP8xWDf+IDshoQjksAiuW66eFPG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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