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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ea7f8576bc3d1264c318af7316a132a0f385feb00fd65374b8cfab6e4319aa' 
  AND token = '5bsq1/wyYT3AYdMtoHp4FlboAbeq/roRVO+ZP3LBCBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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