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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e2f03359342b6b60e8ca533518c5cd33b051b430870701c59794953566408d' 
  AND token = 'CfWaal+n8U1gxxS0QxXCaoSDeosBFKkcA5+e2O+/Au4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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