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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc8e93b546330446e9a1d102d9ca62b1a275af6c193f0cca880c8a5203c1d40' 
  AND token = 'BD96pPtE1tTdxOqub9wSqmriwQLHEM8+ATabI5y0nj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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