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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6328167ac4438c662d2be10dcf94439ed93c11592cd1d188b6f8a1312d26bc40' 
  AND token = 'HvrmhE8U1EpSOKfT0Tpg2gGCcTjCIl1tmrb9BWjXwDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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