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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c0f7ef983a4a1adeb6693aa5f4071800b06d7d6ac1e0bfef93b82d15baf3ef' 
  AND token = 'OaMfYOGKz5zhDEdwSyVawmF1x3TWNK4whPYndlmFVmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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