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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5e4a3a566d86a14f58bcee3408dfadca3f994f26d00d5bcfb15254214a3862' 
  AND token = 'H6at/us2//XkHDiThojGCOHuBolK6n5LO4sfn904O0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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