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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6a11849c56c166118fc1179bd83a794d56b2e7f5f070b20eca53e5a8050d5b' 
  AND token = '7eLTeKuDga6bKwIWCj+ktcbMao17sddK7Et2P/YajkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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