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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea0a23f79303d895996f084e9861b9ede41b8f01297d5fa79ca3d0f40fcaf14' 
  AND token = 'dWYIL98mAIp/2q0iUYsWlK/ij1NsF54uQra8pw4ae8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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