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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ce9f3e16c9e5376f3e25f56a2176583e163c7fafd786a12962678d302e80c2' 
  AND token = 'xLBbhh55LNr8GTfs5DB9ty6HqS6Jj93LH9do4EBED/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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