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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a64e8ef2b7a4d4f32725bec81063e28f03078d13b66bdc9cb4644fe9f0bbcd' 
  AND token = '4PyyVOjpph7cB9mfsI8eBGpQahy0jxaGxde3TLXrmNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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