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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdf9537b89adf30716fcb540f553442c19e85d4c31df88569eff4d050f3d467' 
  AND token = 'srfepPv7EvHJvnz6nnYletBn0t4poyYBD1y+tFp1Nxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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