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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e058e7e0c0238e61c23b164ae05991c63c5e0becc02b10cbb67089a66323bd' 
  AND token = '5O1vpYQyHxvuxKmH0ojCmOElvd8++nYOC7/HpSZIzA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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