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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf67aab64f02a16a4c8962ecf2a8c1b9656c09fd5514bbe606b84eefea16003' 
  AND token = 'trrvGbXm8h5/dIV/lr2AcX1qD7wWZ8ptO5RgqUUjdoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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