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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7ff320543b12b85350a1c56bea8efc06356b5e01067cf887342b3ec1b4782a' 
  AND token = 'J238O5/axogSCo86h4o7lpik2J74Q/69LunFAxeGsUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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